KR101459304B1 - Method and apparatus for optical information processing by using 2-beams code - Google Patents

Abstract

The present invention relates to a method and an apparatus for processing optical information using a two-optical code, the method comprising: generating servo light; Dividing the generated servo light into at least two or more servo lights; The method comprising the steps of: inputting a first servo light among the divided servo lights as an optical signal to an optical information storage medium; Using the second servo light among the divided servo lights as a trigger signal to enter the storage medium next to the first servo light; Sequentially detecting first and second servo lights reflected by a pattern of the servo area corresponding to the first and second servo lights incident on the storage medium; And acquiring data information recorded in a reflection pattern in the servo area by combining the detected first and second servo light information, so that there is no reference clock such as a PLL, or a system in which a pattern reading speed does not exist at a constant speed It is possible to efficiently detect data information.

Optical information, holography, 2-optical code, servo light detection

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for processing optical information using an optical code,

The present invention relates to a method and an apparatus for processing optical information using a two-optical code, and more particularly, to a method and apparatus for processing optical information using a two-optical code in an optical information storage medium for recording and reproducing optical information on a storage medium using holography And an optical information processing method and apparatus using the two-optical code.

2. Description of the Related Art Recently, as information and computer industry progress rapidly, there is a growing demand for a storage device capable of satisfying high capacity storage capacity and high-speed input / output of data.

Accordingly, an optical information storage medium capable of storing and storing high-capacity data and high-speed input / output of data using optical discs is known as a compact disc (CD), a digital versatile disc (DVD), a high definition DVD (HD- Blu-ray Disc (BD), and Holographic Digital Data Storage (HDDS).

An optical information processing apparatus (hereinafter referred to as an optical information processing apparatus) using a holographic digital information storage device separates light emitted from a light source into a reference beam and a signal beam, Optical information is recorded by interference fringes generated by crossing signal light in a storage medium of a photorefractive material such as a photopolymer.

An optical information processing apparatus uses a method of multiplexing light in order to increase the recording density of data. Methods for multiplexing light include angular multiplexing, phase-code multiplexing, wavelength multiplexing, and shift multiplexing. In this case, the angle multiplexing method is to multiplex the reference light with varying incident angles. The phase code multiplexing is performed by modulating the phase spatially, and the wavelength multiplexing is multiplexing according to the wavelength change using the wavelength tunable laser. And multiplexing the recording while moving the storage medium.

In order to reproduce the optical information multiplexed and recorded on the optical information storage medium, the reference light incident upon the optical information recording is restored, the reference light is incident on the interference fringes of the optical information storage medium, And acquires optical information from the reproduction light.

On the other hand, data information such as an address in the optical information storage medium is expressed by '1' and '0' as the length of a physical reflection pattern such as a wobble or a pit.

However, when the optical information storage device can not distinguish the length of the pattern when the data information is represented by '1' and '0' in the length of the reflection pattern in the optical information storage medium, Quot; 0 " can not be accurately determined.

In addition, if the system does not have a reference clock for determining the length, such as a PLL, or if the movement speed at the time of reading the pattern is not equal to the constant speed, the above problem may arise.

SUMMARY OF THE INVENTION The present invention is directed to an optical information processing method and apparatus using a two-optical code for precisely distinguishing data information of '1' and '0' indicated by a length of a reflection pattern using a two- .

According to an aspect of the present invention, there is provided an optical information processing method using a 2-optical code in one aspect. The optical information processing method includes: generating servo light; Dividing the generated servo light into at least two or more servo lights; The method comprising the steps of: inputting a first servo light among the divided servo lights as an optical signal to an optical information storage medium; Using the second servo light among the divided servo lights as a trigger signal to enter the storage medium next to the first servo light; Sequentially detecting first and second servo lights reflected by a pattern of the servo area corresponding to the first and second servo lights incident on the storage medium; And obtaining data information recorded in a reflection pattern in the servo area by combining the detected first and second servo information.

Wherein at least one trigger information before the first reflection pattern formed by the data information and between the reflection patterns formed by the data information in the servo area of the storage medium and before the servo information is generated by the reflection pattern, Further comprising a system.

The step of acquiring the data information recorded in the reflection pattern may include the steps of: associating the first servo light and the second servo light reflected by the pattern of the servo area in a one-to-one correspondence in a time domain; If the second servo light is detected in the same part in the portion where the first servo light is detected as the corresponding result, it is determined that the data information is '1'; Determining that the second servo light is not detected in the portion where the first servo light is not detected and the data information is '0'; If the second servo light is detected in a portion where the first servo light is not detected, determining the data information as '0'; And determining that the second servo light is trigger information other than data information if the second servo light is not detected in the portion where the first servo light is detected.

According to another aspect of the present invention, there is provided an optical information processing apparatus for detecting data information on a servo area having a plurality of reflection patterns. The optical information processing apparatus includes: a servo light source for providing servo light; A light splitter for dividing the servo light into at least two or more servo light; A polarized light separator that transmits or reflects the servo light according to the polarized light of the servo light provided from the light splitter; A? / 4 wave plate for changing the polarized light of the servo light reflected by the polarized light separator to circularly polarized light; A condenser lens for condensing the servo light onto an optical information storage medium; A first servo light and a second servo light which are incident on the storage medium and are reflected by the reflection pattern of the servo area sequentially, and the first and second servo light information to be detected are combined, And a servo light detector for obtaining data information.

The optical splitter is provided as at least one of a diffraction grating and a plurality of diodes to divide the plurality of servo lights.

The first servo light is used as a signal signal and the second servo light is used as a trigger signal.

The optical information storage medium is characterized in that at least one trigger information is formed by the reflection pattern between reflection patterns formed by data information in the servo area and before the first reflection pattern formed by the data information.

Wherein the servo light detector corresponds one-to-one correspondence between the first servo light and the second servo light reflected in the pattern of the servo area in the time domain and if the second servo light is detected in the same part in the portion where the corresponding first servo light is detected, 0 " in the portion where the first servo light is not detected, and " 0 " in the portion where the first servo light is not detected, 0 " when the servo light is detected, and determines that the trigger information is not data information if the second servo light is not detected in the portion where the first servo light is detected.

The optical information processing method and apparatus using the 2-optical code according to the present invention allow the optical information processor to accurately divide the data information indicated by the length of the reflection pattern using the 2-optical code, And the data information can be efficiently detected even in a system in which the pattern reading speed does not exist at a constant speed.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention.

1 is a block diagram showing a part of an optical information processing apparatus using an optical information storage medium according to a preferred embodiment of the present invention.

1, the optical information processing apparatus 200 includes an interference fringe formed by crossing the reference light R and the signal light S in the storage medium 100, (Not shown) for detecting reproduction light P reproduced from a recording medium 100 (hereinafter referred to as a "storage medium"). At this time, the reference beam R and the signal beam S may be a green beam that reacts to the photosensitive medium.

Here, the storage medium 100 has a data area and a servo area. The data area is an area in which optical information is recorded by intersecting the reference light and the signal light, and the servo area is an area where a predetermined pattern for servo control is formed during optical information recording and reproduction.

The storage medium 100 may have a track (TR) structure. The track TR is a path along which the focus of light incident on the storage medium 100 proceeds and each track RT has a track pitch TP which is a physical distance between the tracks TR. At this time, the direction in which the light travels in the track TR is referred to as a tracking direction.

The optical information processing apparatus 200 for this storage medium 100 records optical information by crossing the reference light R and the signal light S in a recording layer (not shown) of the storage medium 100 made of a photosensitive medium do. At this time, the signal light S is loaded with a data page divided into on pixels / off pixels. The optical information processing apparatus 200 also causes the reference light R used for recording the optical information to enter the interference fringe and reproduces the optical information by detecting the reproduction light P from the interference fringe.

On the other hand, in the storage medium 100, the servo area includes a servo control pattern SP such as a division pattern, a position initialization pattern, an address pattern 135, and a tracking servo pattern 137 adjacent to the data area. The servo control pattern SP includes a plurality of reflection patterns (different patterns on pattern) for reflecting the servo light SV and a transmission pattern (another pattern of off patterns) for transmitting the servo light SV. And may be formed on the side from which light is incident from a recording layer (not shown) of the storage medium 100. [

The optical information processing apparatus 200 controls the position of the storage medium 100 and the incident position of the reference beam R and the signal beam S by confirming a reflection pattern provided in the servo area before optical information recording and reproduction, The servo control is performed.

Here, the optical information processing apparatus 200 according to the present invention can obtain the data information using the 2-optical code from the reflection pattern by causing the servo light SV divided into a plurality of lights to enter the storage medium 100 .

The optical information processing apparatus 200 includes a servo light source 210 for providing a servo light SV, a light splitter 220 for dividing the servo light SV into a plurality of servo light SVs, a light splitter 220 A polarized light separator 230 that transmits or reflects the servo light SV in accordance with the polarized light of the servo light SV provided from the polarized light separator 230 and the polarized light of the servo light SV reflected by the polarized light separator 230 into circular polarized light a? / 4 wave plate 250 and a condenser lens 270 for condensing the servo light SV with the optical information storage medium 100. At this time, the servo beam SV is preferably a red beam having a wavelength that does not react with the photosensitive medium.

The optical information processing apparatus 200 further includes a servo light detector 290 for detecting the servo light SV in the path of the servo light SV reflected by the storage medium 100 when the servo light SV is incident thereon Respectively. The SV detector 290 may be a photodiode capable of detecting the intensity of the detected servo light SV.

The optical information processing apparatus 200 having such a configuration provides the servo light SV of P polarized light from the servo light source 210. [ The servo beam SV of P polarized light is divided into at least two or more beams by a beam splitter, and the beam splitter includes an optical element such as a diffraction grating to simultaneously convert the P polarized servo beam SV into a plurality of servo beams SV It can oscillate. In addition, the light splitter may include a plurality of diodes according to another embodiment to oscillate a plurality of lights.

The P polarized servo light SV divided into a plurality of P polarized light beams is reflected by the polarized light separator 230 and converted into circularly polarized light through the? / 4 wave plate 250, and a plurality of servo lights SV is incident on the storage medium 100 by the condenser lens 270. The servo light SV incident on the storage medium 100 is reflected by the reflective pattern of the servo area 130 and the servo light SV incident on the data area 110 is stored And transmits the medium 100.

Thereafter, the plurality of servo beams SV reflected from the respective reflection patterns of the servo area 130 are changed from the circularly polarized light to the S polarized light while passing through the condenser lens 270 and the? / 4 wave plate 250, And passes through the separator 230. The servo light SV transmitted through the polarized light separator 230 is detected by a servo light (SV) detector 290.

The optical information processing apparatus 200 uses the first servo light SV as a signal signal and the second servo light SV as a trigger signal among a plurality of servo lights SV incident on the storage medium 100 have. The optical information processing apparatus 200 combines the first and second servo information SV reflected from the pattern of the storage medium 100 and detects the data information Can be obtained.

FIG. 2 is a diagram illustrating a method of forming a pattern of a servo area of a storage medium 100 according to a preferred embodiment of the present invention. FIG. 3 is a diagram illustrating a pattern of a storage medium 100 according to a preferred embodiment of the present invention. And FIG.

Referring to FIG. 2, <a> indicates a pattern formed in the servo area of the conventional storage medium 100, and <b> indicates a pattern formed in the servo area of the storage medium 100 according to the present invention. That is, the optical information processing apparatus 200 according to the present invention can make the pattern formed in the servo area include the trigger information t in addition to the data information.

For example, when forming the data information of '1101001' in the pattern of the storage medium 100, the optical information processing apparatus 200 conventionally formed servo areas by only combining four reflection patterns and three transmission patterns According to the present invention, it is possible to form eight reflection patterns and three transmission patterns with 't110t10t0t1' in which the data information and the trigger information (t) are combined. Here, the trigger information t is formed in a reflection pattern.

3, the optical information processing apparatus 200 according to the present invention includes a first servo beam SV as a signal signal among a plurality of servo beams SV divided from a beam splitter, And incident on the storage medium 100 using the second servo light SV as a trigger signal after the first servo light SV is incident.

4 is a diagram illustrating a method of acquiring data information from a signal signal and a trigger signal reflected from a pattern of the storage medium 100 according to a preferred embodiment of the present invention.

Referring to FIG. 4, the optical information processing apparatus 200 according to the present invention may be configured to correspond to the first and second servo lights SV incident on the storage medium 100 according to the embodiments of FIGS. 2 and 3 The first and second servo light SV reflected from the pattern of the storage medium 100 can be detected as a signal signal and a trigger signal.

4, the optical information processing apparatus 200 associates the detected signal signal and the trigger signal in a one-to-one correspondence in the time domain, and when the trigger signal is detected at the same portion where the signal signal is detected, 1 &quot;, the trigger signal is not detected in the portion where the signal signal is not detected, and it can be determined as the data information '0'. When the trigger signal is detected in the portion where the signal signal is not detected, the optical information processing apparatus 200 determines that the data information is '0'. If the trigger signal is not detected in the portion where the signal signal is detected, .

5 is a flowchart illustrating a method of acquiring data information of an optical information storage medium 100 using a two-optical code according to a preferred embodiment of the present invention.

Referring to FIG. 5, the optical information processing apparatus 200 generates a P-polarized servo light SV through a servo light source provided in step S11, and outputs the generated servo light SV to at least two or more servo light sources SV (S12).

The optical information processing apparatus 200 uses the first servo light SV as a signal signal among the plurality of servo light SV to enter the optical information storage medium 100 at step S13 and outputs the second servo light SV And is used as a trigger signal to enter the optical information storage medium 100 (S14). At this time, since the first and second servo lights SV pass through the data area of the optical information storage medium 100, they pass without searching for the data area, and only the servo area can be searched.

The optical information processing apparatus 200 sequentially processes the first and second servo lights SV reflected in the pattern of the servo area corresponding to the first and second servo lights SV incident on the storage medium 100 (S15, S16). Here, the pattern of the servo area is composed of a reflection pattern for reflecting the servo light SV and a transmission pattern for transmitting the servo light SV, so that the optical information processing apparatus 200 can detect the first and second 2 servo light SV can be detected.

The optical information processing apparatus 200 may combine the detected first and second servo light SV information to obtain data information recorded in a reflection pattern in the servo area (S17). Here, the optical information processing apparatus 200 associates the first servo light SV and the second servo light SV reflected by the pattern of the servo area in a one-to-one correspondence in the time domain, and when the corresponding first servo light SV is detected The second servo light SV is not detected at the portion where the first servo light SV is not detected and the data information 0 '. When the second servo light SV is detected in the portion where the first servo light SV is not detected, the optical information processing apparatus 200 determines that the data information is '0'. In the portion where the first servo light SV is detected If the second servo light SV is not detected, it can be judged as trigger information, not data information.

Accordingly, the optical information processing apparatus 200 can obtain data information recorded in a reflection pattern in the servo area of the optical information storage medium 100, that is, the optical information recording medium 100, even if there is no reference clock such as a PLL, 1 'and' 0 ', respectively.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. And changes may be made without departing from the spirit and scope of the invention. Accordingly, modifications of the embodiments of the present invention will not depart from the scope of the present invention.

1 is a block diagram showing a part of an optical information processing apparatus using an optical information storage medium according to a preferred embodiment of the present invention.

2 is a diagram illustrating a pattern forming method of a storage medium servo area according to a preferred embodiment of the present invention.

3 is a view illustrating a method of making 2-light incident on a pattern of a storage medium according to a preferred embodiment of the present invention.

4 is a diagram illustrating a method of acquiring data information from a signal signal and a trigger signal reflected from a pattern of a storage medium according to a preferred embodiment of the present invention.

5 is a flowchart illustrating a method of acquiring data information of an optical information storage medium using a 2-optical code according to a preferred embodiment of the present invention.

Claims (8)

Generating servo light; Dividing the generated servo light into at least two or more servo lights; The method comprising the steps of: inputting a first servo light among the divided servo lights as an optical signal to an optical information storage medium; Using the second servo light among the divided servo lights as a trigger signal to enter the storage medium next to the first servo light; Sequentially detecting first and second servo lights reflected by a pattern of the servo area corresponding to the first and second servo lights incident on the storage medium; And Acquiring data information recorded in a reflection pattern in the servo area by combining the detected first and second servo information Lt; / RTI &gt; The step of generating at least one trigger information between the reflection patterns formed by the data information in the servo area of the storage medium and the first reflection pattern formed by the data information before the step of generating the servo light, Further comprising: Wherein the step of acquiring the data information recorded with the reflection pattern includes a step of mapping the first servo light and the second servo light reflected by the pattern of the servo area one to one in the time domain, Determining if the second servo light is identical to the data information, determining the data information to be '1'; if the second servo light is not detected in the portion where the first servo light is not detected, Determining if the second servo light is detected in a portion where the first servo light is not detected, determining the data information as '0'; and if the second servo light is not detected in the portion where the first servo light is detected, The optical information processing method comprising the steps of: delete delete An optical information processing apparatus for detecting data information on a servo area having a plurality of reflection patterns, A servo light source for providing servo light; A light splitter for dividing the servo light into at least two or more servo light; A polarized light separator that transmits or reflects the servo light according to the polarized light of the servo light provided from the light splitter; A? / 4 wave plate for changing the polarized light of the servo light reflected by the polarized light separator to circularly polarized light; A condenser lens for condensing the servo light onto an optical information storage medium; And A first servo light and a second servo light which are incident on the storage medium and are reflected by the reflection pattern of the servo area sequentially, and the first and second servo light information to be detected are combined, And a servo light detector for obtaining data information, Wherein the optical information storage medium has at least one trigger information formed between the reflection patterns formed by the data information in the servo area and the first reflection pattern formed by the data information in the reflection pattern, Wherein the servo light detector corresponds one-to-one correspondence between the first servo light and the second servo light reflected in the pattern of the servo area in the time domain and if the second servo light is detected in the same part in the portion where the corresponding first servo light is detected, 0 &quot; if the second servo light is not detected in the portion where the first servo light is not detected, and &quot; 0 &quot; in the portion where the first servo light is not detected, And determines that the trigger information is not data information if the second servo light is not detected in a portion where the first servo light is detected. The optical pickup apparatus according to claim 4, And a plurality of diodes, and divides the plurality of servo lights into at least one of a diffraction grating and a plurality of diodes. 5. The optical information processing apparatus according to claim 4, wherein the first servo light is used as a signal signal and the second servo light is used as a trigger signal. delete delete

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